Remove/install ignition coils

AR15.12-P-2003MT

Remove/install ignition coils

18.11.2019

Engine

133 in model 117, 156, 176

Engine

270 in model 117, 156, 176, 242, 246.2

Shown on engine 270.910 in model 117

1

Engine cover

a

Spark plug connector

T1/3

Cylinder 3 ignition coil

2

Air intake pipe

T1/1

Cylinder 1 ignition coil

T1/4

Cylinder 4 ignition coil

3

Bolts

T1/2

Cylinder 2 ignition coil

Shown on engine 133 in model 176

8

Bracket

9

Bracket

G3/2x1

Electrical connector for oxygen sensor upstream of catalytic converter

 Warning

Risk of injury. Skin or eye injuries may result when handling hot or glowing objects.

Wear protective gloves, protective clothing and safety glasses, if necessary.

AS00.00-Z-0002-01A

 Danger

Risk of death when working on component parts and systems with U >= 30 V alternating voltage (AC) or U >= 60 V direct voltage (DC)

Do not touch damaged or defective live component parts and lines or non-insulated electrical connections and lines.

AS00.00-Z-0035-01A

Topical note

Notes on avoiding damage to ignition system

AH15.10-P-0002-01V

 

Remove/install

1

Remove upper engine cover (1)

2.1

Remove air intake pipe (2)

Engine 270 in model 117, 156, 176, 242, 246.2
except code 494 (US version)

AR09.10-P-8131MT

2.2

Detach air intake pipe (2) at ATL and air filter housing and lay outside the working area

Engine 270 in model 117, 156
with code 494 (US version)

AR09.10-P-8131MTU

 Installation: The vent lines, the oil separator and the air intake pipe (2) are firmly connected together. Therefore the oil separator, the vent lines and the air intake pipe(2) must be replaced after disconnection of the connection.

2.3

Detach holder (8) on ATL and place vent lines and purge lines to one side

Engine 133 in model 117, 156, 176


Do not bend vent and purge lines too strongly.
Leaks and damage can occur otherwise and this must be replaced.

 Bolt, bracket for vent line

*BA09.40-P-1008-01X

3

Detach coolant hose from holder (9) and place to one side

Engine 133 in model 117, 156, 176

4

Disconnect electrical connection for oxygen sensor upstream catalytic converter (G3/2x1) from bracket (9)

Engine 133 in model 117, 156, 176

5

Remove bracket (9)

Engine 133 in model 117, 156, 176

6

Disconnect electrical connection on ignition coils (T1/1 to T1/4)

7

Remove screw/bolts (3) for ignition coils (T1/1 to T1/4)

 Screw/bolt, ignition coil to cylinder head cover

*BA15.10-P-1001-04A

8

Detach ignition coils (T1/1 up to T1/4) with spark plug connectors (a) upwards and take out

 Installation:
To reduce the force required for plugging/unplugging the spark plug connector, grease must be applied before installation of the spark plug connector.
Otherwise the spark plug connector will be damaged when removed again.

 Installation: Discharge approx. Fill 1 g of spark plug connector grease into the spark plug connector.

Spark plug connector grease

*BR00.45-Z-1102-06A



Check

9

Check ignition coils (T1/1 up to T1/4) and spark plug connectors (a) for damage and replace if necessary

10

Check protective hose and spark plug connector (a) at ignition coil (T1/1 to T1/4) and replace if necessary

 Installation: For renewal of the spark plug connector (a), the cutouts are fully engaged in the boat shells on both sides.

11

Install in the reverse order

12

Read out fault memory using the diagnostic system and clear if necessary



AD00.00-P-2000-04A

 Turbocharger

Number

Designation

Engine 133

BA09.40-P-1008-01X

Bolt, bracket for vent line

Nm

20

 Ignition coil

Number

Designation

Engine 133

Engine 270

BA15.10-P-1001-04A

Screw/bolt, ignition coil to cylinder head cover

Nm

9

9

Repair materials

Number

Designation

Order number

BR00.45-Z-1102-06A

Spark plug connector grease

A 002 989 80 51